On Tue, Nov 25, 2008 at 08:47:16AM +0100, Marcus Wolschon wrote:
That's pretty small given that kernel/user split is usually 2G/2G or even 3G/1G...Okay, on a big AMD-multicore-laptop the limit in Java seems to be 1GB of memory-mapped files.
Have you tried using a smaller -Xmx size? I have the impression that Java allocates the maximum allowed size directly on startup, relying on the OS to do lazy allocation of pages. If that's the case, reducing -Xmx should increase free virtual address space, allowing bigger memory mappings.Ulimit was "unlimited" and --XX:MaxDirectMemorySize was set to 32GB -Xmx was a few GB. I am using the current Java6 -patchlevel 10 from Sun.
I'd like to try this on a 64bit-Linux on that box but don't know how to do that yet. Any help on turning a debian 32bit into a 64-bit or runningI don't think that's possible. Both 32bit and 64bit userspace and emulation work with a 64bit kernel, but at least 64bit userspace on a 32bit kernel isn't possible.a 64bit-VM in a 32bit-Linux?
CU Sascha -- http://sascha.silbe.org/ http://www.infra-silbe.de/
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